I know this has been discussed before for larger diameter & width rims (i.e. 17's), however, I plan on getting 15's mainly for the weight. The rims I am looking at are 15x6.5 and have an offset of 38. I know I read before that the 7" wide wheels needed at least a 40 mm offset. So, would a 38 mm offset be sufficient for a 6.5" rim?